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53 lines
1.4 KiB
Markdown
53 lines
1.4 KiB
Markdown
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# selector-max-compound-selectors
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Limit the number of compound selectors in a selector.
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```css
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div .bar[data-val] > a.baz + .boom > #lorem {}
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/* ↑ ↑ ↑ ↑ ↑
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Lv1 Lv2 Lv3 Lv4 Lv5 -- these are compound selectors */
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```
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A [compound selector](https://www.w3.org/TR/selectors4/#compound) is a chain of one or more simple (tag, class, id, universal, attribute) selectors. If there is more than one compound selector in a complete selector, they will be separated by combinators (e.g. ` `, `+`, `>`). One reason why you might want to limit the number of compound selectors is described in the [SMACSS book](https://smacss.com/book/applicability).
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This rule resolves nested selectors before calculating the depth of a selector.
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`:not()` is considered one compound selector irrespective to the complexity of the selector inside it. The rule *does* process that inner selector, but does so separately, independent of the main selector.
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## Options
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`int`: Maximum compound selectors allowed.
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For example, with `3`:
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The following patterns are considered warnings:
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```css
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.foo .bar .baz .lorem {}
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```
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```css
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.foo .baz {
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& > .bar .lorem {}
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}
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```
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The following patterns are *not* considered warnings:
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```css
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div {}
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```
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```css
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.foo div {}
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```
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```css
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#foo #bar > #baz {}
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```
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```css
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.foo + div :not (a b ~ c) {} /* `a b ~ c` is inside :not() and is processed separately */
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```
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